TY - JOUR AU - Demény, Attila AU - Kern, Zoltán AU - Németh, Alexandra AU - Frisia, S AU - Hatvani, István Gábor AU - Czuppon, György AU - Leél-Őssy, Szabolcs AU - Molnár, Mihály AU - Óvári, Mihály AU - Surányi, Gergely AU - Gilli, A AU - Wu, CC AU - Shen, CC TI - North Atlantic influences on climate conditions in East-Central Europe in the late Holocene reflected by flowstone compositions JF - QUATERNARY INTERNATIONAL J2 - QUATERN INT VL - 512 PY - 2019 SP - 99 EP - 112 PG - 14 SN - 1040-6182 DO - 10.1016/j.quaint.2019.02.014 UR - https://m2.mtmt.hu/api/publication/30688739 ID - 30688739 LA - English DB - MTMT ER - TY - JOUR AU - Demény, Attila AU - Czuppon, György AU - Kern, Zoltán AU - Leél-Őssy, Szabolcs AU - Németh, Alexandra AU - Szabó, Máté Zoltán AU - Tóth, Mária AU - Wu, C-C AU - Shen, C-C AU - Molnár, Mihály AU - Németh, Tibor AU - Németh, Péter AU - Óvári, Mihály TI - Recrystallization-induced oxygen isotope changes in inclusion-hosted water of speleothems - Paleoclimatological implications JF - QUATERNARY INTERNATIONAL J2 - QUATERN INT VL - 415 PY - 2016 SP - 25 EP - 32 PG - 8 SN - 1040-6182 DO - 10.1016/j.quaint.2015.11.137 UR - https://m2.mtmt.hu/api/publication/3042991 ID - 3042991 AB - The issue of diagenetic alteration of carbonate deposits in caves (speleothems) has gained increasing importance in recent years, as this process has serious consequences for speleothem-based paleoclimate studies. In this study stable hydrogen and oxygen isotope data of water trapped in fluid inclusions were collected for recently forming stalagmites and flowstones in order to determine how dripwater compositions are reflected and preserved in the inclusion water compositions. Hydrogen isotope compositions were found to reflect dripwater values, whereas the oxygen isotope data were increasingly shifted from the local dripwater compositions with the time elapsed after deposition. The δ18O data are correlated with X-Ray diffraction full width at half maximum values (related to crystal domain size and lattice strain), suggesting that the oxygen isotope shift is related to recrystallization of calcite. Transmission electron microscope analyses detected the presence of nanocrystalline (<50 nm) calcite, whose crystallization to coarser-grained calcite crystals (>200 nm) may have induced re-equilibration between the carbonate and the trapped inclusion water. The Ostwald ripening process provides an explanation for unexpectedly low oxygen isotope compositions in the inclusion water. The detected diagenetic alteration and its isotopic effects should be taken into consideration during sampling strategies and data evaluation as speleothems containing nanocrystalline calcite during their deposition are prone to late-stage oxygen isotope water-carbonate re-equilibration, which may shift the oxygen isotope composition of the inclusion water to more depleted values while the hydrogen isotope composition remains intact. © 2016. LA - English DB - MTMT ER - TY - JOUR AU - Kele, Sándor AU - Breitenbach, SFM AU - Capezzuoli, E AU - Meckler, AN AU - Ziegler, M AU - Millan, IM AU - Kluge, T AU - Deák, József AU - Hanselmann, K AU - John, CM AU - Yan, H AU - Liu, Z AU - Bernasconi, SM TI - Temperature dependence of oxygen- and clumped isotope fractionation in carbonates: A study of travertines and tufas in the 6-95°C temperature range JF - GEOCHIMICA ET COSMOCHIMICA ACTA J2 - GEOCHIM COSMOCHIM AC VL - 168 PY - 2015 SP - 172 EP - 192 PG - 21 SN - 0016-7037 DO - 10.1016/j.gca.2015.06.032 UR - https://m2.mtmt.hu/api/publication/2952323 ID - 2952323 LA - English DB - MTMT ER - TY - JOUR AU - Czuppon, György AU - Ramsay, RR AU - Özgenc, I AU - Demény, Attila AU - Gwalani, LG AU - Rogers, K AU - Eves, A AU - Papp, László AU - Palcsu, László AU - Berkesi, Márta AU - Downes, PJ TI - Stable (H, O, C) and noble-gas (He and Ar) isotopic compositions from calcite and fluorite in the Speewah Dome, Kimberley Region, Western Australia: implications for the conditions of crystallization and evidence for the influence of crustal-mantle fluid mixing JF - MINERALOGY AND PETROLOGY J2 - MINER PETROL VL - 108 PY - 2014 IS - 6 SP - 759 EP - 775 PG - 17 SN - 0930-0708 DO - 10.1007/s00710-014-0333-7 UR - https://m2.mtmt.hu/api/publication/2779728 ID - 2779728 N1 - Institute for Geological and Geochemical Research, Research Centre for Astronomy and Earth Sciences, Hungarian Academy of Sciences, Budaörsi út 45, Budapest, 1112, Hungary C/- Trident Capital Ltd, Level 24, 44 St Georges Tce, Perth, 6000, Australia Department of Geology, Tinaztepe Campus, Dokuz Eylul University, 35160 – Buca, Izmir, Turkey Speewah Research Project C/- King River Copper Limited, B-26/122 Mounts Bay Road, Perth, WA 6000, Australia Centre for Exploration Targeting, ARC Centre for Core to Crust Fluid Systems, University of Western Australia, Crawley, WA 6009, Australia Hertelendi Laboratory of Environmental Studies of the Institute of Nuclear Research of the Academy of Sciences, Bem tér 18/C, Debrecen, H-4026, Hungary Lithosphere Fluid Research Lab, Department of Petrology and Geochemistry, Institute of Geography and Earth Sciences, Eötvös University, Pázmány P. stny 1/C, Budapest, 1117, Hungary Department of Earth and Planetary Sciences, Western Australian Museum, Locked Bag 49, Welshpool DC, WA 6986, Australia Export Date: 14 December 2020 Correspondence Address: Czuppon, G.; Institute for Geological and Geochemical Research, Research Centre for Astronomy and Earth Sciences, Hungarian Academy of Sciences, Budaörsi út 45, Hungary LA - English DB - MTMT ER - TY - JOUR AU - Demény, Attila AU - Siklósy, Zoltán TI - Combination of off-line preparation and continuous flow mass spectrometry: D/H analyses of inclusion waters JF - RAPID COMMUNICATIONS IN MASS SPECTROMETRY J2 - RAPID COMMUN MASS SPECTR VL - 22 PY - 2008 IS - 8 SP - 1329 EP - 1334 PG - 6 SN - 0951-4198 DO - 10.1002/rcm.3473 UR - https://m2.mtmt.hu/api/publication/1237884 ID - 1237884 LA - English DB - MTMT ER -